MAPPING CORIOLIS-COUPLED QUANTUM DYNAMICS ONTO PARALLEL COMPUTER ARCHITECTURES

We describe how quantum dynamics calculations with large total angular momentum quantum numbers J can be efficiently carried out on scalable parallel computers. In our approach, different processors i are assoc iated with different allowed values of Omega, the projection quantum n umber of total angular momentum on a body-fixed axis. Omega can take o n values Omega = 0, 1,..., J. One strategy involves associating proces sors i = 0, 1,..., J directly with the corresponding Omega values. Cor iolis coupling permits only Omega+/-1 coupling, which implies only nea rest neighbor processors need to communicate. This ''Coriolis-coupled' ' parallel model and certain variations are applied to a triatomic uni molecular fragmentation process. Due to the necessity of communication between processors and load balancing issues, our model does not scal e ideally with J. However, for the example considered, one can achieve wall clock times for reasonably high J values that are within about a factor of two of J=0 calculations.